In a nutshell, the Marshall all-valve, 4-channel JVM410H 100-Watt tube head is the most versatile Marshall amplifier ever made. It also boasts more gain than any other Marshall to date--and that's really saying something!

Each of its 4 channels--Clean, Crunch, OD1 & OD2 — are not only completely independent of each other, they all boast 3 Modes, all 12 of which are footswitchable and feature their own unique gain structure. It makes the JVM 4-channel effectively 12 Marshalls in one!

The JVM410H has studio-quality digital reverb with a level control for each channel. This is also footswitchable, as are the amp's two Master Volume controls and the Series/Parallel effects loop. Resonance and Presence are equipped with master controls.

Even though the head and combo both house 28 controls and 8 LED switches on their front panels, they're incredibly simple to understand because of the extremely logical layout. Each of the 4 channels has the usual suspects when it comes to controls — Volume, Bass, Middle, Treble & Gain--accounting for 20 of the 28 controls right away. Take away the 4 reverb controls and you're only left with 4 Master controls--2 Master Volumes plus Resonance & Presence.

Add to this an ingenious footswitch (UK patent pending) and the fact all the amp's switching (channel/modes, Reverb, Master Volume selection, FX loop) can be done via MIDI and you're looking at an incredibly flexible amp! The 6-way footswitch boasts 7 LEDs and memory, plus it connects to the amp via a regular guitar cable.

From the cleanest clean to the filthiest distortion ever found in a Marshall and all points in-between, the JVM410H all-valve amp head will give you whatever tone you need right when you need it.

The Marshall JVM410H Tube Amp Head is a professional-quality, sophisticated amp head from British amp-maker Marshall. Marshall has fueled the sounds of almost five decades of guitarists and is one of the most respected and trusted names in the guitar world.

With an all-valve construction, four independent channels, and a 100 Watt valve head, this amp is both highly versatile and built to power even the largest of cabinets.

The booming sound of the Marshall JVM410H can fill even the largest spaces with any tone ranging from clean to crunchy. Perfect for performances and the studio alike, the four independent channels feature three modes each. This combination of modes and channels makes this Marshall model the equivalent of twelve amplifiers in one, providing a wide range of tones for any style of music.

The clean channel produces a pure, simple, bluesy sound, while the crunchy channel supplies a distortion perfect for rock. OD1 and OD2 are high-gain and even higher-gain channels that give a roaring, fire-breathing tone for hard rock and metal.

Here's a nice comprehension video review of this amp complimentary of Robert Renman at Dolphinstreet.com:

A unique foot switch can change between channels, allowing for easy, on-the-go customization. The foot controls don't stop at switching the channels, thoughthe studio quality digital reverb, channel modes, and master volume levels can also be controlled by foot switches. The foot switches even have memory capabilities so custom tones can be stored and controlled with the tap of a toe. Although the Marshall comes with enough custom modes to suit most needs, additional foot switches can be added through MIDI In and Thru connections for even more flexibility.

Further customization is also possible using the studio-quality digital reverb, and the 28 controls and 8 LED switches available for each channel. All of this customization is easy to achieve using the sleek, logical design of the front panel.

Adjustments can be made almost intuitively due to the simple array of knobs. Featuring the classic white script of the Marshall logo above a strip of gold and black vinyl siding, this amp head brings a look of class and sophistication to any rig.

With all of the versatility provided by custom features and the quality sound assured by Marshall, the Marshall JVM410H can be the cornerstone of any cabinet. The product of decades of Marshall experience, this amp will hold up to plenty of use on the road or in the studio, and is sure to stand the test of time.

In a sentence: The Marshall JVM410H amp head is a highly-sought after, professional amplifier for serious guitarists who are interested in only the best and have the skills and resources to back up its amazing amplification ability. An all-time classic indeed.